Hydrochloric Acid → 4-Chloro-3-(3-{[5-cyano-2-propyl-4-(trifluoromethyl)-1H-indol-1-yl]methyl}-1,2,4-oxadiazol-5-yl)benzoic acid

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To a solution of methyl 4-chloro-3-(3-{[5-cyano-2-propyl-4-(trifluoromethyl)-1H-indol-1-yl]methyl}-1,2,4-oxadiazol-5-yl)benzoate (Example 293) (0.190 g, 0.378 mmol) in 1,4-dioxane (70 mL) was added LiOH—H2O (0.063 g, 1.50 mmol) and water (30 mL). The mixture was stirred at rt for 17 h followed by cooling to 0-5° C. The solution was made acidic using concentrated HCl, extracted into Et2O, dried (MgSO4) and concentrated to afford a pure solid (0.131 g, 71% yield): MS (ES) m/z 488 (M+).

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